航天发动机用铌钨合金复合硅化物涂层制备及性能研究  

Study on Preparation and Performance of Composite Silicide Coating on Nb-W Alloy for Space Engine

作　　者：赵刚 刘尖 周小军 白晓东 张静 ZHAO Gang;LIU Jian;ZHOU Xiao-jun;BAI Xiao-dong;ZHANG Jing(Ningxia Orient Tantalum Industry Co.,Ltd.,Shizuishan 753000,China;State Key laboratory of Special Rare Metal Materials.Northwest Rare Metal Materials Research Institute,Shizuishan 753000.China;National Engineering Research Center of Tantalum and Niobium Materials,Shizuishan 753000,China)

机构地区：[1]宁夏东方钽业股份有限公司,宁夏石嘴山753000 [2]西北稀有金属材料研究院稀有金属特种材料国家重点实验室,宁夏石嘴山753000 [3]国家钽铌特种金属材料工程技术中心,宁夏石嘴山753000

出　　处：《稀有金属与硬质合金》2023年第5期44-49,共6页Rare Metals and Cemented Carbides

基　　金：宁夏自治区重点研发计划项目(2018BDE23009)。

摘　　要：采用叠层料浆熔烧法在铌钨合金上制备复合硅化物涂层,旨在综合提升铌钨合金的静载长程抗氧化能力和抗热震能力。实验结果显示,涂层具有良好的耐高温、抗氧化性能,在1800℃下的静态抗氧化寿命达到了640 min以上,1700℃下抗热震性能达680次以上,经1500℃氧乙炔火焰冲刷3600 s后仍完好无损。经长时间氧化测试后,涂层开始贫Si化,同时Nb含量因扩散作用而显著增加;当表层开始出现富Nb氧化物时,涂层失效。此外,涂层与铌钨合金仍然存在热膨胀系数失配的问题,导致1700℃热震测试达680次以上时,涂层开始出现宏观裂纹,进而引起涂层失效。The laminated slurry melting method was used to prepare the composite silicide coating on Nb-W alloy,aiming at comprehensively improving the long-range oxidation resistance under static load and thermal shock resistance of the alloy.The results show that the coating has good resistance to high temperature and oxidation,with a static oxidation resistance of over 640 min at 1800℃and thermal shock resistance of over 680 times at 1700℃.It can also withstand the impingement of oxyacetylene flame at 1500℃for 3600 s.After the long-range oxidation test,the coating begins to deplete Si while the Nb content significantly increases due to diffusion.And as the Nb-rich oxides start to appear in the surface layer of the coating,the coating fails.In addition,there still is a mismatch of the thermal expansion coefficient between the coating and the Nb-W alloy,which results in macroscopic cracks in the coating after 680 times of thermal shock tests at 1700℃,thus leading to the failure of the coating.

关 键 词：铌钨合金 复合涂层 硅化物 抗氧化性能 抗热震性能 抗火焰冲刷性能 

分 类 号：TG178[金属学及工艺—金属表面处理]